Quote:
Originally Posted by s_c5519
From what I have read if you have been using 93 from the start, it will not require the fuse pull...
But the cars arrive to the dealers with very little gas. Do you think that the little it comes with from GM is 93 though? I'm talking before the dealer fills it...
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My current understanding is that 91 octane places the ECM into its highest performance mode. 93 octane is not programmed into the ECM, so its use will make no direct increase in performance over 91 octane.